Vibrator for molding-machines.



PATENTED AUG. 1, 1905.

P. w. HALL. VIBRATOR FOR MOLDING MACHINES.

I IV V E IV TOR Helen? 7% Ba w i 4 1 W m Y f m 3 H W e x N m J k ii UNITED STATES PATENT OFFICE.

FREDERICK W. HALL, OF MERCHANTVILLE, NEW JERSEY, ASSIGNOR OF ONE-HALF TO J. W. PAXSON COMPANY, OF PHILADELPHIA, PENN- SYLVANIA, A CORPORATION OF PENNSYLVANIA.

VIBRATOR FOR MOLDING-MACHINES.

Patented Aug. l, 1905.

Application filed May 14,1904. Serial No. 208,020.

To all whom, it nuty concern.-

Be it known that I, FREDERICK W. HALL, a citizen of the United States, residing at Merchantville, Camden county, State of New Jersey, have invented certain new and useful Improvements in Vibrators for Molding-Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

The invention to be hereinafter described relates to vibrators, and more especially to that type designed for use in connection with molds for casting.

It is well understood that after sand has been properly rammed about the patterns in a flask the sand or other molding material is liable to cling to the patterns, so that on removal of the patterns the mold-cavity is liable to be injured unless care be taken to prevent adherence of the sand or other ma terial to the patterns.

The object of the present invention is to provide a vibrator of simple construction adapted for connection to the pattern-carrying element or other part of the flask, whereby the patterns may be given a tremulous vibration prior to their removal from the molding material, and thereby prevent adherence of such material thereto; and the invention consists of such a device wherein the parts are compactly disposed and the casing and plunger whereof shall contain the necessary ports and passages for controlling the motor fluid in a convenient and simple manner.

Further, the invention consists of the parts and combinations hereinafter more fully described, and definitely pointed out in the claims.

In the drawings, Figure 1 is a longitudinal central section of a device embodying -the present invention. Fig. 2 is a cross-section on line :1: 0c of Fig. 1. Fig. 3 is a cross-section on line y y of Fig. 1, and Fig. 4 is a detail view of the controlling-plug to be described.

Referring to Fig. 1, A designates the vibrator as awhole, comprising the casing or cylinder B, preferably cylindrical in form, and hav ing a central enlargement B, provided. with the two balancing chambers b b, which are separated by the central dividing-wall 1), substantially equal to the length of stroke of the plunger for a purpose as will hereinafter more fully appear. The balancing chambers b b extend through the internal circumference or area of the cylinder B, and disposed in the walls of the cylinder on each side of said chambers are the exhaust-ports 6 o The ends of cylinder B are preferably open and provided with the internal screw-threads b 5 which receive the external threads'on the end plugs C C, each of which has an impact-head c c to receive the blow of the plunger, as will be apparent. By reason of the screw-thread connection between the end plugs and the cylinder a readymeans is provided for assembling and taking apart the device when it becomes desirable to replace worn parts, inspect the interior of the cylinder, or adjust the length of stroke of the plunger. One of the end plugs C has a flange 0, provided with a hole 0 by which it can be readily attached to the part to be vibrated, and the opposite end plug C has an extension 0 provided with an internal screwthread for ready attachment to a source of motor-fluid supply. The end plug C has a central passage-way 0, extending part way 'therethrough and then turned to one side, as

at 0 to connect with a passage-way a, formed in the wall of cylinder B. Also formed in the wall of cylinderB are the inlets c 0 connecting directly with the balancing chambers b 1), formed on the interior of cylinder B, as already explained. Disposed between the passage-ways c and 0 and passing through a flange C of the end plug C and into the wall of the cylinder B is the regulating-plug D, provided with an axial and radial passage-wayd. The regulating-plug has a groove d formed near one end, and a pin d passing through the wall of the cylinder, engages said groove in a manner to permit the plug to be turned axially, but prevents endwise movement thereof. From this construction it will be seen that the regulating-plug D holds the end plug C in position of its adjustment, and by axial movement of the plug the amount of motor fluid permitted to pass into passageway a may be readily controlled to thereby regulate the character of the plunger action, as will presently appear. Freely movable within the cylinder B is the plunger E, having the diametrical passages or openings e e, which connect with the axial or longitudinal passages e e, respectively, formed in the plunger and each extending from its connection with its diametrical passage 6 e to its respective end of the plunger. It will be noted that the respective ends of the plunger are formed to a less diameter than the main body thereof, forming hammering-heads E E, and connecting the cut-away portion 6 at the peripheral base of the hammering-heads with the axial passages e e are the diagonal passages e2 e Assuming the plunger to be at one end of its strokesay to the right hand in the drawing Fig. 1-the air or motor fluid will pass from passage way 0 into the balancingchambers b b, and thereby prevent binding of the plunger in the cylinder, and since the right-hand diametrical passage-way e is then in communication with one of the chambers 1) air or motor fluid will flow through pas-- sage-ways e 6 into the space surrounding the hammering -head, as well also as directly against the impact-head c, and the plunger will be forced to the left. As the right-hand passage-way 6 passes the chamber 6 and engages the wall I) the flow of air ormotor fluid is shut off from the right-hand end of the cylinder and exhaust-port b to the right is uncovered as the plunger delivers its blow to the left end plug O, whereupon the same action is repeated at the left end of the cylinder, as described, for the right-hand end, all as will be obvious to one skilled in the art.

The plunger will ordinarily rest at one end of the cylinder.

I do not Wish to restrict my invention to the specific construction herein set forth, as it is obvious that many minor points may be materially changed without in any manner departing from the spirit and scope of my inventionas, for example, the interposition of cushioning or yielding devices between the plunger-head and cylinder end, whereby the plunger-head and cylinder end will be prevented from having direct contact.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a vibrator, the combination of a cylinder having balancing chambers formed therein and extending circumferentially the interior thereof, and exhaust-ports disposed on opposite sides of said chambers, a plun-.

ger loosely disposed within said cylinder and having diametrical and axial passage-ways adapted to alternately communicate with said chambers as the plunger is moved longi tudinally of said cylinder, and means for supfilyilng said chambers directly with a motor 2. In a vibrator, the combination of a cylinder having interior balancing chambers, a wall separating said chambers, means for supplying motor fluid directly to said balancingchambers, a plunger movable in said cylinder and having diametrical and axial passage-ways adapted to be brought into alternate communication with said balancing chambers as the plunger is moved longitudinally therein and exhaust-ports on opposite sides of said chambers.

3. In a vibrator, the combination of a cylinder having a central enlargement, balancing chambers formed on the inner portion of said enlargement, a wall separating said chambers, exhaust-ports on opposite sides of said chambers, adjustable plugs having impact-heads of less diameter'than the internal diameter of the cylinder, a plunger having diametrical passage-ways adapted tov be brought into alternate communication with said chambers as the plunger is moved longi tudinally of said cylinder, said plunger having reduced hammering-heads and axial and diagonal passage-Ways connecting the diametrical passage ways with the ends of the plunger.

4. In a vibrator, the combination of a cylinder having a central enlargement, balancing chambers formed on the inner portion of said enlargement, a wall separating said chambers, exhaust-ports on opposite sides of said chambers, adjustable plugs having impact-heads of less diameter than the internal diameter of the cylinder, a plunger having diametrical passage ways adapted to be brought into alternate communication with said chambers as the plunger is moved longitudinally of said cylinder, said plunger hav ing reduced hammering-heads and axial and diagonal passage-ways connecting the diametrical pas'sage-ways with the ends of the plunger and means for controlling the quantity of fluid admitted to said balancing chambers.

5. In a vibrator, the combination of a cylinder having balancing chambers formed on the interior thereof, end plugs closing the ends of said cylinder, a plunger having diametrical passage-ways adapted to be brought into alternate communication .with said chambers as the plunger is reciprocated, a

. passage-way leading from one end of the cylinder to said chambers, a regulating and adjusting plug having an axial and radial passage-way and adapted to be turned axially to regulate the flow of motor fluid to said chamber.

6. In a vibrator, a cylinder having two balancing chambers formed on the interior thereof, end plugs for closing the ends of said cylinder, one of said plugs being formed With a passage-way for motor fluid, a passageway formed longitudinal of the cylinder, a regulating-plug having axial and radial passages and disposed between the said two passage-ways, means for preventing longitudinal movement of the regulating and adjusting plug, rotative movement of said regulatingplug controlling the quantitiy of fluid admitsaid groove to prevent longitudinal movement thereof, rotative movement of the plug partially closing the communication between its radial passage and the passage-Way in the end plug, and a plunger movable in said cylinder.

In testimony whereof I have hereunto affixed my signature this 9th day of May, A. D.

FREDERICK W. HALL. Witnesses:

CHAS. W. MILLER, A. M. BIDDLE. 

